Water-in-oil type emulsion cosmetics

Abstract

Water-in-oil type emulsion cosmetics containing (a) polyaspartic acid or a salt thereof, (b) a spherical powder, (c) an oily component, (d) a lipophilic surfactant, (e) a pigment, and (f) water can achieve superior makeup effects, good moist feeling, superior emulsion stability and pigment dispersibility.

1 . A water-in-oil type emulsion cosmetic comprising:
 (a) at least one polyaspartic acid or a salt thereof,   (b) at least one spherical powder,   (c) at least one oily component,   (d) at least one lipophilic surfactant,   (e) at least one pigment, and   (f) water.   
     
     
         2 . The emulsion cosmetic according to  claim 1 , wherein a content (W a ) of the (a) at least one polyaspartic acid or a salt thereof is 0.01 mass % to 1 mass % as a content of a free form thereof, based on the total mass of the cosmetic. 
     
     
         3 . The emulsion cosmetic according to  claim 1 , wherein the (b) at least one spherical powder is one or more members selected from the group consisting of spherical silicic anhydride, spherical silicone powder, spherical nylon powder, spherical cellulose powder, and spherical polyurethane powder. 
     
     
         4 . The emulsion cosmetic according to  claim 1 , wherein the (b) at least one spherical powder has a volume-based average particle size of 0.1 µm to 30 µm. 
     
     
         5 . The emulsion cosmetic according to  claim 1 , wherein a content (W b ) of the (b) at least one spherical powder is 0.1 mass % to 5 mass %, based on the total mass of the cosmetic. 
     
     
         6 . The emulsion cosmetic according to  claim 1 , wherein the (c) at least one oily component is one or more members selected from the group consisting of hydrocarbon, ester, and silicone oil. 
     
     
         7 . The emulsion cosmetic according to  claim 1 , wherein a content (W c ) of the (c) at least one oily component is 5 mass % to 60 mass %, based on the total mass of the cosmetic. 
     
     
         8 . The emulsion cosmetic according to  claim 1 , wherein the (d) at least one lipophilic surfactant is one or more members selected from the group consisting of glycerol fatty acid ester, sorbitan fatty acid ester, and polyoxyethylene·polyoxypropylene modified alkylmethylpolysiloxane·dimethylpolysiloxane copolymer, each of which has a Hydrophilic-Lipophilic Balance (HLB) value of 3 to 6. 
     
     
         9 . The emulsion cosmetic according to  claim 1 , wherein a content (W d ) of the (d) at least one lipophilic surfactant is 0.1 mass % to 10 mass %, based on the total amount of the cosmetic. 
     
     
         10 . The emulsion cosmetic according to  claim 1 , wherein the (e) at least one pigment is an inorganic pigment. 
     
     
         11 . The emulsion cosmetic according to  claim 1 , further comprising (g) at least one hydrophilic or water-soluble additive for cosmetics. 
     
     
         12 . The emulsion cosmetic according to  claim 11 , wherein the (g) at least one hydrophilic or water-soluble additive for cosmetics is one or more members selected from the group consisting of (g-1) at least one amino acid and a salt thereof, (g-2) at least one aliphatic hydroxycarboxylic acid having 1 to 10 carbon atoms and a salt thereof, (g-3) at least one polyhydric alcohol, and (g-4) at least one betaine. 
     
     
         13 . The emulsion cosmetic according to  claim 1 , which has a viscosity of not less than 10 Pa·sat 25° C. 
     
     
         14 . A method of making up skin, comprising applying a water-in-oil type emulsion cosmetic according to  claim 1  to skin. 
     
     
         15 . The method according to  claim 14 , wherein a content (W a ) of the (a) at least one polyaspartic acid or a salt thereof in the cosmetic is 0.01 mass % to 1 mass % as a content of a free form thereof, based on the total mass of the cosmetic. 
     
     
         16 . The method according to  claim 14 , wherein the (b) at least one spherical powder is one or more members selected from the group consisting of spherical silicic anhydride, spherical silicone powder, spherical nylon powder, spherical cellulose powder, and spherical polyurethane powder. 
     
     
         17 . The method according to  claim 14 , wherein the (b) at least one spherical powder has a volume-based average particle size of 0.1 µm to 30 µm. 
     
     
         18 . The method according to  claim 14 , wherein a content (W b ) of the (b) at least one spherical powder in the cosmetic is 0.1 mass % to 5 mass %, based on the total mass of the cosmetic. 
     
     
         19 . The method according to  claim 14 , wherein the (c) at least one oily component is one or more members selected from the group consisting of hydrocarbon, ester, and silicone oil. 
     
     
         20 . The method according to  claim 14 , wherein a content (W c ) of the (c) at least one oily component in the cosmetic is 5 mass % to 60 mass %, based on the total mass of the cosmetic.